Atacama Yellow 35is build thread

[B21]

Should send the pics to BMW head office and it may persuade them to put Atacama yellow back on the options list.

Imagine a G29 in that colour

Just can’t understand it…the Supra in a lovely yellow is made on the same production line in the same factory….

[B21]

Well first limited shake down run to the local Chinese takeaway and I’m pleased…

Maybe a placebo effect but the change in front damping from almost no damping (whatever 20 clicks out is) to 9 clicks (one stiffer than recommended) means the front end is no longer nodding in left / right transitions.

The Conti Sports 7 are much better suited to the E89 than the MP4S..the steering has so much more feel and is better balanced…not as heavy at slower speeds (despite having a 245/35 rather than a 235/35 front tyre) but proportionally firming up with great steering angle…very nice.

Maybe the sizes are the perfect fit for the rims rather than being a tad overstretched on the 437Ms.

Getting there..much happier..

[B21]

Finally after waiting for over 5 months my new VTT turbo outlet pipes have arrived.

https://vargasturbo.com/product/n54-alu ... bo-outlet/

These complete the plumbing required to take fresh air from the air filter box / dual cone intakes through the turbos and then out onto the inter cooler. I have a VSRF charge pipe to take the air from the inter cooler to the manifold ready to go plus the uprated piping from the airbox to the turbos.

The unavailability of these were one reason I halted the fitting of the TTE500 turbos as fitting all this plumbing is a real bitch and I don’t want to pay twice to open up all the pipe work.

In the flesh I’m surprised how small bore the turbo air outlets are..picture is an iPhone 12 Pro for scale.

So another goody for the winter upgrade program…

[ronk]

I’m looking forward to the Dyno’ run!

[B21]

The same DPD man brought my new Brembo HP2000 rear pads for the 35is (has a larger rear disc than the 18i/20i/28/23i/30i)

They are another of the ‘ceramic’ marketed pads.

Nice quality feel of the packaging.

Interesting comparison calculator here..

https://www.racetechnologies.com/brake-pad-comparison

Will be interested to see how we get on with them, the rears are never as stressed as the fronts..but they do generate an awful lot of dust..they score well on that count..

[B21]

I’m looking forward to the Dyno’ run!

Yes Ron, once the ‘season’ finishes I’ll be tearing the old bits out and then the fun starts…

What’s your guess on the same dyno as I’ve always used for BHP and NM at the crank?

[ronk]

I really don’t know what torque figure to expect but BHP I suspect 425 (ish)

[The.Analyst]

I really don’t know what torque figure to expect but BHP I suspect 425 (ish)

I think it’s going to be considerably higher..you will have to junk the air box though..

Looking good B21, how’s the handling now?

[ronk]

I hope it is higher
A pal has an Audi R3 and with some tweaks it’s running 490 ish

[Nanu]

Love reading this thread even though I have no idea what everyone is talking about most of the time

[B21]

I hope it is higher
A pal has an Audi R3 and with some tweaks it’s running 490 ish

Those Audi engines are very impressive…but he’s already starting at 400 BHP as stock..

550 BHP at the crank is my target / plan …FWIW

[ronk]

550 BHP - that should do you well for a while!

[B21]

550 BHP - that should do you well for a while!

It will be the end of the power development line….after that point it becomes power for only the pursuit of power and an arbitrary increase in various straight line performance characteristics that bear no relevance to a road based car.

The only subsequent refinements will be issues relating to drive ability ie spool up time, throttle response, power modulation.

I still maintain a 300 BHP N20 powered E89 will show a clean pair of heels to a 400 BHP 35is on almost all UK public roads that have a few corners …but I’ve now sold that puppy..

Just have to enjoy the torrrrrqqquuueeeee…

[ronk]

Would you return to a 300 BHP N20?
Now If I were a betting man

[B21]

Would you return to a 300 BHP N20?
Now If I were a betting man

If I could re-roll the dice then I wouldn’t have bought the 35is , a further iteration was that once I bought it, before I started spending big bucks on it then I would have sold it.

If the N20 E89 had been trashed for whatever reason I would have bought a second hand G29 M40i and started modding that.

However we are where we are…I’ve sorted almost all the issues you can sort out on a N54 E89 and I have enough high value parts to keep it going at little cost for at least 10 years and 100k miles…so it’s a keeper.

Makes sense?